/Engine/Source/Editor/SequencerCore/Public/MVVM/Selection/SequencerCoreSelectionTypes.h
Selection set that defines a fragment selection of a view model where each fragment is globally unique. A good example isFKeyHandleor any other monotomic counter. Selection must be associated with a view model type defined by the template parameter ModelType.
template<typename KeyType, typename ModelType> class TUniqueFragmentSelectionSet : public [UE::Sequencer::FSelectionBase](API\Editor\SequencerCore\MVVM\Selection\FSelectionBase)